RELIANCE 76876-31R precision split bronze sleeve bearing
76876-31R is a precision split bronze sleeve bearing manufactured by RELIANCE Electric, specially engineered as original spare part for E5800 and E6800 series heavy-duty industrial DC motors. The component is fabricated from high-strength tin-lead bronze alloy with precision machined internal lubrication grooves and split open structure. Optimized for heavy radial load and continuous long-time rotating service under harsh industrial working conditions with vibration and fluctuating load, it serves as direct replacement component for aged or worn original bearing bushes during motor overhaul and field equipment maintenance.
Description
1. Product Introduction
76876-31R is a precision split bronze sleeve bearing manufactured by RELIANCE Electric, specially engineered as original spare part for E5800 and E6800 series heavy-duty industrial DC motors. The component is fabricated from high-strength tin-lead bronze alloy with precision machined internal lubrication grooves and split open structure. Optimized for heavy radial load and continuous long-time rotating service under harsh industrial working conditions with vibration and fluctuating load, it serves as direct replacement component for aged or worn original bearing bushes during motor overhaul and field equipment maintenance.
2. Model Definition Explanation
76876 is the base part number representing the standard dimensional and structural specification of this series motor sleeve bearing for designated RELIANCE large DC motor platform. The numeral 31 refers to fixed size grade matching specific motor shaft and bearing housing installation dimensions. The suffix R indicates revised upgraded design with optimized inner oil groove layout and improved alloy formulation compared with earlier non-R variants for better wear resistance.
3. Technical Specifications
The bearing is made of dense tin-lead bronze raw material. Its applicable working ambient temperature ranges from -20 degrees Celsius to 80 degrees Celsius. The allowable maximum linear operating speed under regular grease lubrication is limited within 3.5 meters per second. It can sustain continuous heavy radial load designed for matching heavy industrial drive shafts. The inner bore, outer diameter and width follow factory standardized precision machining tolerance for press-fit assembly. The relative working humidity has no strict restriction as it is a pure mechanical component without sensitive electronic parts.
4. Interface and Communication Configuration
This is an entirely mechanical fitting part with no wiring terminals, electronic contacts or digital communication circuits. Its outer cylindrical surface forms mechanical interference fit with motor bearing pedestal inner hole, while the inner spherical bore matches the outer circle of motor main shaft journal. The split notch is reserved for convenient on-site installation without complete shaft removal. No fieldbus, analog or digital communication interface is equipped on this component, and no expansion space for any communication accessory exists. Lubrication is realized through external centralized grease filling port of bearing housing.
5. Core Functions
It bears heavy radial load generated by rotating motor main shaft during equipment operation and reduces mechanical friction between rotor shaft and bearing base via bronze self-lubricating property. Precisely machined internal oil grooves store injected lubricating grease to avoid dry friction and direct metal abrasion. The split structure absorbs slight radial runout and mechanical vibration of the rotating shaft, protecting motor shaft journal from scratch and jamming failure caused by excessive wear.
6. Application Scenarios
It is exclusively matched with RELIANCE E5800 and E6800 series large DC drive motors, widely applied in steel mill rolling transmission equipment, heavy extruder drive assemblies, mine main conveyor driving units and oversized industrial fan prime mover systems. The product is commonly stocked as maintenance spare part for periodic overhaul and damaged bearing replacement in metallurgy, heavy machinery, chemical and building material manufacturing industries.
7. Operation and Maintenance Instructions
Cut off total equipment power supply and lock out power source before disassembly and replacement to ensure construction safety. Fully clean residual waste grease and surface burr of bearing pedestal cavity and motor shaft journal before mounting new bearing bush. Inject high-temperature lithium-based grease through the designated lubrication nozzle every one to three months based on on-site dust and ambient condition. Regularly check equipment running noise and shaft vibration amplitude; replace the bearing promptly once abnormal noise or excessive vibration appears caused by overwear, and forbid long-term over-tolerance service of worn bearing components.
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